2.5" Closed Ring with Boss Head Clamp Metal Labware_Metal Bases & Rods 5 inch specific gravity cylinder

5 inch specific gravity cylinder with a top hook

and light-path tracing experiments across a full optics-lab class set

the f/4 curvature stretching the focal throw for projection-style image formation and reflector telescope analogues

Plano-cylindrical lens at 50 by 50mm with 17 diopter optical power and ground polished edges

this six-metal density cube set of brass

2.5" Closed Ring with Boss Head Clamp Metal Labware_Metal Bases & Rods 5 inch specific gravity cylinderIntegrated open boss head pairs with a 2. 5 inch closed ring on this plated mild steel retort accessory, accepting vertical rods from 5 16 to 5 8 inch for quick ring placement.